Support Scientist for GNSS Radio Occultation Activities

ESSIC and the Cooperative Institute for Satellite Earth System Studies (CISESS), University of Maryland, College Park, is seeking a support scientist.

 

Date posted

Aug. 15, 2019 12:00 am

Application deadline

Sep. 15, 2019 12:00 am

Organization

ESSIC and the Cooperative Institute for Satellite Earth System Studies (CISESS)

Location

  • United States

Job description

Support Scientist for GNSS Radio Occultation Activities

Department: UMD/ESSIC/CISESS 
Starting Salary: Commensurate with experience 
Closing Date: Friday, September 20, 2019 

Duties:

ESSIC and the Cooperative Institute for Satellite Earth System Studies (CISESS) of University of Maryland, College Park, is seeking a support scientist for the Global Navigation Satellite System (GNSS) Radio Occultation(RO) Calibration/Validation work.

The support Scientist will primarily work on the RO data conversion from low level GNSS observations to high level profiles (e.g. bending angle) as a member of the NOAA/NESDIS/STAR RO team. GNSS RO is an active remote sensing technique that provides valuable information on the vertical variations of electron density in the ionosphere and temperature, pressure, and water vapor in the stratosphere and troposphere. The bending angle profiles derived from RO signals have been used in operational numerical weather prediction (NWP) system through data assimilation to correct temperature bias in the forecasts. The RO team supports NOAA’s COSMIC-2 and Commercial Weather Data Pilot program (CWDP) Interactive Calibration/Validation System tasks.

The candidate will work with the team lead on comparison/validation of Precise Orbit Determination (POD) results for GNSS satellites and LEO (low Earth orbit) satellites, on coding and upgrading scripts to automate the processing procedures from raw GNSS observations to high level bending angle profiles. The candidate will perform inter-satellite co-location RO profile comparisons and prediction of the location of the RO profile, and expect occasionally web interface design for displaying results.  

The candidate is expected to contribute to the following:

  • Routinely running POD software and positioning software to produce and compare/validate the satellite orbital ephemeris and velocity results.
  • Conversion of the POD results under different coordinate systems (ECEF/ECI) and working on polynomial interpolation on different time system.
  • Coding scripts and automation for low level to high level data conversion.
  • Supporting inter-LEO excess phase/bending angle comparisons which are obtained from different processing procedures/centers.
  • Algorithm implementation for RO processing on different levels.
  • Help on simple web-contents design for displaying RO results on different levels.
  • Publish research results in peer-reviewed journals and participate in conferences.

Qualifications: Knowledge, Skills and Abilities:

  • Strong Experience with code development in FORTRAN/C/C++, script language (bash,perl etc) in Linux/Unix environments, and visualization coding in IDL and/or matlab.
  • Experience with processing large amounts of observational dataset using multiple threads/clusters.
  • Experience with standard data format, e.g. netCDF-4, BUFR and GRIB etc.
  • Good understanding of Algebra, vector and matrix manipulation, least square analysis, Fourier Transformation etc.
  • Basic understanding of GNSS positioning theory

For more details

http://essic.umd.edu/joom2/index.php/employment/2870-support-scientist-for-gnss-radio-occultation-activities